TRANSMISSION 0637521 - Caterpillar

neutral start function controls the start relay. This function ensures that the engine will not be started under conditions that would allow the machine to be moved unexpectedly. The neutral start function also performs system checks in order to protect the starting motor and the electrical system.This starting motor is engaged when the following conditions are satisfied.
The shift lever is in the NEUTRAL position.
The operator switch for the park brake is engaged.
The key start switch is in the START position.
The system voltage is below 36 volts.
The engine speed is 0 rpm.
The cycle for the engine prelubrication is completed or the engine prelubrication is turned off.
The ejector lever is in HOLD. (AZZ)Once the starting motor is turned on, the starting motor will disengage once any of the conditions that are listed below are detected:
The shift lever is not in neutral.
The operator switch for the park brake is NOT engaged.
The key start switch is NOT in the START position.
The engine speed is above 300 rpm.
The system voltage is above 36 volts.
The ejector lever is NOT in HOLD. (AZZ)